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yap-6.3/OPTYap/pthread_locks.h
2010-01-22 22:30:11 +00:00

54 lines
1.9 KiB
C

/*************************************************************************
* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: pthread_locks.h *
* Last rev: *
* mods: *
* comments: *
* *
*************************************************************************/
#include <pthread.h>
/* ----------------------------------- **
** Atomic locks for PTHREADS **
** ----------------------------------- */
#define INIT_LOCK(LOCK_VAR) pthread_mutex_init(&(LOCK_VAR), NULL)
#define DESTROY_LOCK(LOCK_VAR) pthread_mutex_destroy(&(LOCK_VAR))
#define TRY_LOCK(LOCK_PTR) pthread_mutex_trylock(&(LOCK_VAR))
#define LOCK(LOCK_VAR) pthread_mutex_lock(&(LOCK_VAR))
#define UNLOCK(LOCK_VAR) pthread_mutex_unlock(&(LOCK_VAR))
static inline int
xIS_LOCKED(pthread_mutex_t *LOCK_VAR) {
if (pthread_mutex_trylock(LOCK_VAR) == 0) {
pthread_mutex_unlock(LOCK_VAR);
return TRUE;
}
return FALSE;
}
static inline int
xIS_UNLOCKED(pthread_mutex_t *LOCK_VAR) {
if (pthread_mutex_trylock(LOCK_VAR) == 0) {
pthread_mutex_unlock(LOCK_VAR);
return FALSE;
}
return TRUE;
}
#define IS_LOCKED(LOCK_VAR) xIS_LOCKED(&(LOCK_VAR))
#define IS_UNLOCKED(LOCK_VAR) xIS_UNLOCKED(&(LOCK_VAR))
#define INIT_RWLOCK(X) pthread_rwlock_init(&(X), NULL)
#define DESTROY_RWLOCK(X) pthread_rwlock_destroy(&(X))
#define READ_LOCK(X) pthread_rwlock_rdlock(&(X))
#define READ_UNLOCK(X) pthread_rwlock_unlock(&(X))
#define WRITE_LOCK(X) pthread_rwlock_wrlock(&(X))
#define WRITE_UNLOCK(X) pthread_rwlock_unlock(&(X))